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Long-Term Debt And Liquidity (Narrative) (Details) (USD $)
 0 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended
Apr. 23, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Apr. 23, 2014
Minimum [Member]
Apr. 23, 2014
Maximum [Member]
Jun. 30, 2014
Senior Notes [Member]
Dec. 31, 2013
Senior Notes [Member]
Nov. 20, 2012
Senior Notes [Member]
Jun. 30, 2014
Senior Notes [Member]
Minimum [Member]
Nov. 20, 2012
Senior Notes [Member]
Maximum [Member]
Nov. 30, 2010
Senior Subordinated Notes [Member]
Jun. 30, 2014
Senior Subordinated Notes [Member]
Dec. 31, 2013
Senior Subordinated Notes [Member]
Sep. 30, 2013
Senior Subordinated Notes [Member]
Debt Instrument [Line Items]                              
Long-term Debt, Fair Value   $ 559,900,000 $ 549,800,000                        
Long-term Debt   551,533,000 541,593,000       300,000,000 300,000,000         181,720,000 175,675,000  
Line of Credit Facility, Maximum Borrowing Capacity 470,000,000                            
Repurchase Percentage Price Of Aggregate Principal Due To Change In Control                 101.00%            
Interest rate description   LIBOR plus a margin ranging from 1.5% to 2.25% (depending on our total net leverage ratio and/or senior unsecured rating) or, in the case of dollar denominated loans, the alternate base rate plus a margin ranging from 0.50% to 1.25% (depending upon such ratio or rating). The alternate base rate is the highest of (i) the prime rate announced by JPMorgan Chase Bank, N.A., (ii) the federal fund effective rate plus one-half of 1.0% and (iii) the London interbank offering rate (as adjusted) for a one-month period plus 1.0%. GrafTech Finance, Luxembourg Holdco and Swissco pay a per annum fee ranging from 0.25% to 0.40% (depending on such ratio or rating) on the undrawn portion of the commitments under the Revolving Facility.                          
LIBOR plus margin percentage         1.25% 2.00%                  
Alternate base rate plus margin percentage         0.25% 1.00%                  
Addition to federal effective fund rate to determine base rate       0.50%                      
Percentage of one-month interest rate plus London interbank offering rate 1.00%                            
Per annum fee by GrafTech Finance and Swissco         0.20% 0.35%                  
Financial covenants, minimum interest coverage ratio 2.50                            
Financial covenants, maximum net senior secured leverage ratio 3.00                            
Face amount of debt issued in connection with acquisition                       200,000,000      
Debt instruments maturity date                         2015    
Senior Subordinated Notes interest rate   7.00%                   7.00%      
Loan balance, net of unamortized discount                         175,700,000   181,700,000
Debt Instrument, Face Amount                 300,000,000            
Debt Instrument, Interest Rate, Stated Percentage       6.375%         6.375%            
Redemption Price Percentage Of Principal Prior To November 15, 2016                 100.00%            
Aggregate Principal Redemption Percentage Price Prior To November 15, 2015                     35.00%        
Redemption Price Percentage Of Principal Prior To November 15, 2015                 106.375%            
Unpaid Indebtness After Maturity Or Acceleration                   50,000,000          
Unpaid Judgment Or Decree                   $ 50,000,000